Skip to main content

Mortality estimates and biological reference points for the Natal stumpnose Rhabdosargus sarba (Pisces: Sparidae) in KwaZulu-Natal, South Africa

Buy Article:

$51.35 plus tax (Refund Policy)

Abstract:

A per-recruit stock assessment was undertaken for the sparid Rhabdosargus sarba, which is caught in estuarine and marine shore fisheries in KwaZulu-Natal. Input parameters used in the analyses included age and growth parameters and mortality estimates from catch curves. The mortality estimates from estuarine and coastal catch curves were very different. Total and fishing mortality from estuaries was much higher, because adult R. sarba emigrate out of estuaries and fishing pressure on juveniles in estuaries is substantial. As a consequence two separate models were run for estuarine and coastal fisheries. The results of the spawning biomass per-recruit model indicate that R. sarba is at 34% (in estuaries) to 63% (in coastal fisheries) of its unfished level. Because estuarine estimates of fishing mortality (F) include emigration, the results indicate that R. sarba in KwaZulu-Natal is not at present overexploited. These results were substantiated by analysing available trends in catch per unit effort (CPUE) for this species.

Keywords: ESTUARINE AND SHORE FISHERIES; KWAZULU-NATAL COAST; LINEFISH MANAGEMENT; PER-RECRUIT STOCK ASSESSMENT

Document Type: Research Article

Publication date: January 1, 2004

More about this publication?
  • Co-Published by NISC and Taylor & Francis - Subscriber access available here
tandf/ajas/2004/00000029/00000001/art00007
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more